Detailed steps to reproduce the problem:
1.display an image using "imgcat", this is my own C version. not used in this example, but has options to display image at specific locations on screen, adjust sizes, etc.debuglog.txt.zip
2.use "less" to display a text file, it uses an alternate vt100 screen
3.exit less, original screen is restored, but previous images are now only solid filled boxes

What happened: previously displayed images are only solid filled boxes

What should have happened: original images would still have been visible